smyth



0. M. SMYTH.

Lamp. No. 79924 Patented July 14, I868.

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"om 1n M. SMYTH, or ORANGE, NEW JERSEY, ASSIGNOR To BENJAMIN r. SMALL,or NEW YORK orrr,

Letters Patent No. 79,924, dated July 14, 1868.

IMPROVEMENT IN LAMPS.

TO ALL W'HOM IT MAY CONCERN:

Be it known that I, DAVID M. SMYTH, of Orange, in the county of Essex,and State of New Jersey, have invented a new and useful Safety-LampBody, und that the following is a full, clear, and exact description andspecification of my said invention. I

The objects of my invention are, to enable the lamp-body to retain, theliquid contained in it when it is overturned, to increase its strengthso that it opposes a powerful resistance to a crushing force, and topresent a large surface, compared with its internal capacity, tothe'air, so that the air may keep it cool.

To these ends, my invention consists of a lamp-body, composed of a smalltube or tubes, coiled or otherwise constructed, so as to form smallcells, communicating with each other and with the burner.

- My invention maybe carried into effect in various forms, one of whichis represented in the accompanying drawing. in which- I t Figure 1represents aside view of a safety-tube lamnbody constructed according tomy invention.

Figure 2 represents a plan of th'e'same, and h Figure 3 represents avertical section of the same at the line a; :2: of fig. 2

The lamp-body thus represented is formed of a metal tube, A, which iswound in a conical coil, one -of its extremities being turned up in theinterior of the coil to form the wick-chamber b and receive the burner,which may be screwed to the neck a at the upper end of the wiek'clmmber.

The wick-chamber is connected with the uppermost coil (2 of the tube bya. small hole, e, so that, when the kerosene or other combustible fluidis poured into the wiclcchamber b, the air in the coils d d, &c., mayescape and permit the fluid to enter.

In the lamp-body thus constructed, each coil of the tube forms a cell,containing a small quantity of the fluid, and, as all the coilscommunicate, the liquid can pass freely to the \\'ic-I -el1auiber.Moreover, as each coil of tube is small in area, it opposes a powerfulresistance to a'crushing force, so that the lamp-body is not liable tobe broken by the overturning of a railroad-car, or other accidents towhich lamp-bodies are subjected in practical use. It will also be seenthat the quantity of fluid that can escape from the body, in case it beupset, is'extre'mely small, as the cellsformed by the coils will retainit, and the liquid can in any event escape no faster than it can makeits way through the small air-hole e. Moreovcryas enough wick may beused to fill the wick-chamber b, the risk of the escape of fluid, incase of a. partial or'compleie upsetef the lamp-botly. is extremelysmall. As thecoils of tube form cells of'small eross-section,surrounding a hollow space F within the coils, the air hasfree access tothem, and carries off the heat rapidly, so that the lamp-body is notliable to'overheat. ,9

Although I prefer to construct my lainp boclies in the form representedin the drawing, that form is not essential to the invention, as it isevident that small eonnectedcells may be formed by coiling or bendingthe nbe in various forms other than conical. So also it is not essentialthat the nir-opc1 :in, in' the uppermosbcoil or cell should communicatewith the wick-chamber 5, as it may communicate with the external air.

I am aware that a tube more or loss bent has been used in lumps toconnect the burner with the body or can that constitutes the reservoirof .fluid, but I do not claim such :1 tube-cmmeclion, as my inventionhas reference to the construction of the body itself.

What I'elaiin as my invention, and desire to securcby Letters Patent, is

The safetydarnp body, formed of a tube, and'construeted substantially ashereiubeforo set forth.

In testiniony whereof, I have hereto set my hand, this 8th day of April,D. 1863.

r i DAVID M. SMY'iH.

Witnesses Jss. W. IIALE, P. QALLsonkN.

